Key action for typewriting and other key-operating machines



Jan.l, 1929.. 1,697,415

0. U. DESHA KEY ACTION FOR TYPEWRITING AND OTHER KEY OPERATING MACHINES Filed Sept. 8, 1925 2 Sheets-Sheet 1 A JG E9717 3% \'4 Jain. 1, 1929. 1,697,415

, o. u. DE SHA KEY ACTION FOR TYPEWHITING AND OTHER KEY OPERATING MACHINES Filed Sept. 8, 1925 2 Sheets-Sheet 2 Patented Jan. 1, 192a.

ORVILLE. tr. nnsna. or, rear co LrIvs, cor-Joanne;

xnre'crron roe TYPEWRITING AND OTHER xnY ornnnr ne MACHINES.

Application filed September My invention relates to key-action for type writers and other type ba r'and'key operating mach'1nes,}actuat11ig means at all times being operatively connecting the type bar and key lever, moving the type bar to printing point upon the depression of a key-l'everand means reversely breaking the said connection after the printing impact of the type bar'for the return of the type bar to normal position while the key lever is in depressed position this broad object being the subyect matter of an apphcation'fil'ed by me on November 5th,

I 1923,Seri'al No. 672,871, which issued as Patent 1,643,203 September 20, 1927, as a contradistinction betweenprevious devices cornprising detachable connection or gap at 5 some point between the key lever andtype tural features of said machines as they now exist; I haveshow'n mv mvcntion embodied,

in the present instant: in the Lu-C. Smith Brothers standard machine, and in which the invention may be readily incorporated by v slight modification or structural features of the machine 1n eiiecting such incorporation. It should be understood, however, that the invention is not restricted to use in a machine of this type, but may be employed Wherever found available. 5

The desired principle of operation, new.

,niaec'hanical function, operative expedients,

' and other objectsa-nd advantages will, hereinafter be described in the following disclosure. and will be more particularly pointed out in the appending claims. In theaccompanying drawings, wherein like reference characters indicate corresponding parts in the various views In the drawings Figure I, is a vertical section of a typewriting machine, one key-action only being shown in normal position; Fig. 11 represents a view of the key mechanism similar to Fig. I, the key lever being shown in a s, 1925. Serial No. 55,227. I

depressed position and responding the bar. Fig. III, also is akey --mechan1sn1's1milar toF I, the key lever beinjgshovvn in a depressed position and the type bar returned to its initial position. Fi g. IV is a skeleton view of the key mechanism for il -histrative purposes in describing the mode of operation of machine shown. Fig, Vis a cross'se'ction of certain parts o f 'my invention. It is understood, of course, that for the sake of 'clearness and to avoid complication of drawings the. applicant has omitted to show or describe the remainder cit key levers and type bars "as Well as other devices necessary or advisable in the complete machine.

In the embodimentrin Fig. 1,1 indicates the frameot the typewriter, 1 indicates the front and 1 the rear, having a {power driven paper carriage '2 "supported in the rear on guide rod 3 and-in front on guide rod 14 the principal parts of the carriage not being shown in the drawing; 5 indicates the CIOIIl mon platen carried by paper carr1ageg2-p6 indicates one of the'usu al type b-a-rscarrying type 7 at its front end, and having an ecoentrio pivot 8 at the heel of rear, end, and is arranged to turn on pivot 9 in thefor-m of a segment basket disposed vertically below frame face of the plate; 10 and 10 1 indicating part of the basket frame subject-r ing the type bar 6 to basket shiftflthereby providing the type 7 with av common printing point A, as the type bar 6 turnson pivot 9 from the-normal horizontalposition of the rest on the segment 11; 12 indicates one of the key levers carrying at the frontend finger key 13, the rear end pivoted at l4 to barjhi in the. rear of the machine, andis kept nor mally in its elevated position by return spring 15 supported bydbar 1'5 at normal rest of key lever bearing against the under side of stop .barl5 above the front part the key leyer 12, in the usual manner.

Key lever 12 is formed-with upward projection 16 and provides .a saddle-backed seat 17 for the trip link coupling hereinafter described. The key lever 12 is described as having two incidents of operation, namely;

closed bythe downward movement of key lever 12 from radius B to radius C, and the the incidentoi depression andincident of le .lease. The incident of: depression disincident of release is disclosed by the-upward 5 movement of key lever 12 backfroni radiusw C to radius B. The type bar 6 is described as having two incidents of operation, namely, the incident of response and the incident of recoil. The incident of response of type bar 6 is disclosed by the movement of the type bar from its initial rest radius E to the printing point A, indicated by radius F, forming arc G from pivot 9. The incident of recoil of type bar 6 is disclosed by its movementfrom its printing point A back to norinalrestE. These incidents of operation are, of course, present, in previous type bar action in so far as the incident of response E to A of the type bar occurs simultaneously with the incident of depression B to C, of key lever 12, and the incident of recoil, A to E, of the type bar occurs simultaneously with the incident of release C to B, of the key lever, but my invention relates to a later correlation of incidents of operation of the key levers with that of the type bar, in conforming to the operative expedient by which both the incident of re sponse, E to A, of the type bar and incident of recoil, A to E,'occur during the one incident of depression, B to C, of the key lever.

In this case, a novel form of trip link coupling peculiarly arranged between the key lever and the type bar accomplishes this oper ative expedient; the form, action and ar- 0 rangement of said trip link coupling being the subject matter of this application, hereinafter described.

18 indicates one of a series of vertically disposed vibratory levers corresponding in number with type bars 6 and key levers 12. Intermediately their ends, the vibratory levers 18 are pivoted at'19 in a bar 20 extending across the machine, and each at its upper end is pivoted at 21 as usual to a. backward pull link 21 which engages the type bar at pivot 8.

22 and 23 are two links of what is described as a trip link coupling, which by way of connecting lever 18 and backward pull link 21 at all times operatively connect the type bar and key lever.

The upward curved draw link 22 is pivoted at 25 to the lower ends of the vibratory lever 18, and the front end of the upward curved draw link 22 is pivoted at 24 to the front end of the thrust link 23, the rear end of the thrust link 23 being pivoted at 26 to the upward projection 16 of the key lever 12.

The relative normal position of pivots 24, 25 and 26 are engaged in a line nearly horizontal with the key lever 12 as shown by J J Fig. IV, disclosing the trip link coupling to be horizontally disposed as distinguished from being engaged perpendicular to the key lever. It will be observed that the upward curved draw link 22. and the thrust link 23, constituting the trip link coupling, operate in a plane above the key lever, disclosing the invention to. be overslung. Also, it will be noted that the upward curved draw links 22 and thrust link 23 operate in front of the vibratory lever 18 disclosing the trip link coupling to forwardly engaged.

27 is a return spring, front end engaging the hole 27 in the rear end of the upward curved draw link 22 and the rear'end of return spring 27 engaging one of the plurality of holes 27 in plate 30 hereinafter described. When the front end of the return spring 27 is pulled forward and upward the rear and moves downward and serves to rock the upward curved draw link 22 on pivot 25 and to hold the vibratory lever 18 normally in position shown in Fig. I and to return it and the type bar 6 to normal position E after operation.

While the upward curved draw link 22 and the thrust link 23 are operating under tension lock, both ends of return spring 27 move in opposition and are drawn to high tension, and then at this stage, the energy is diverted to recoil of the type bar as thrust link 23 is tripped out of tension lock.

28 is an extended nose of the upward curved draw link 22 and is designated as a fulcrum trip nose, pivot 24 being the fulcrum point about which the upward curved draw link 22 turns in cooperating with the saddlebacked seat 17 on top of key lever 12 in lifting thrust link 23 out of responsive tension lock and cooperating with return rod 29 in restoring the coupling to normal operative position during the incident of the release of the key lever.

The mechanical movements, and operation thereof are the important factors in providing the function of the key action. A further description of the operative principles therefore follows: The geometric circle H H Fig. IV, with a horizontal diametrical line J J, from the forward border pivot 24 to backward border pivot 25 .circumscribes what is termed the actuating plane. The horizontal diametrical line J J crossing the actuatiii plane, from the forward border pivot 2 L to the backward border pivot 25 indicates the divert tension line and divides the actuating plane into an upper zone of response K and a lower zone of reaction L; the upper zone of response K having to do with the response of the type bar 6 from radius E to radius F as the key lever 12 is being depressed from radius ii to radius l) and the lower zone of reaction L having to do with the recoil of the type bar 6 from the printing point A to radius E at rest as the key lever 12 is being continually depressed from radius D to ra dius C of depression. The normal or idle position of the upward curved draw link 22 operates in the upper zone of response K as shown in Figures I, II, III, IV. And thrust link '23 operates within the forward radius of the actuating plane. It is necessary that the upward curved draw link 22 and thrust link 23 be, relatively major and minor in meatle th nd. nk 3 2s in s fa m and. so assessn h ns' r d as s t Pe i the interior pivot 26 to oscillate between the forward border pivot 24. and backward border pivot in crossing and recrossing the hori- Zental divert tensien line J J In this case, the. elements 22 and 23 ot' the trip link coupling are folded during the incident of depression from radius B to radius D of the key lever 12 and simultaneously with the incident of response of the type bar 6 from radius E to printing point A; and the hinge-fold elements 22 and 23 unfold during the remainder of depression, radius D to radius C of key lever 12' simultaneously with the recoil of the type bar 6 from printing point- A back to radius E.

The saddle-backed seat 17 provided by the key le er 12 stops the forward border pivot 2d and effects responsive tension lock of trip link 23 under influence ojt return spring 27 as the key lever 1 2'is being depressed from radius B to radius D. This tension lockof thrust link is also described as contractive tension lock meaning that while the key lever 12 is being depressed, the energy required to respond the, type bar 6 effects contractive pressure or thrust from the interiorpivot- 26 to the forward border pivot- 24 instead of expansive tension or pull. The contraetive, tension of thrust link 23 stops its oscillation and is moved bodily edgewise downward with the key lever 12, as shown in Il until, the interior pivot 26 crosses the horizontal divert tension. line. J 'J' into the zone Of reaction L. Simultaneously with contractive' tension lock of thrust link 23, upward curved draw link 22 operates under expansive tension between the forward border pivot 2e and the backward border pivot 25' While the key lever 12 is being depressed from radius Bto radius D to respond the type bar 6 from radius E to printing point A, and the expansive tension of link 22 being relaxed while the key lever continues the incident or depression from radius D to radius 0 and simultaneous ly with the recoil of the type 6 iirom the printingpoint A to, radius of rest E.

By change in relative positions of the forward border pivot 24 and the backward border pivot 25 the interior pivot 26 is brought down within the lower zone of reaction L thereby relwsine the coutractive tension lock of thrustlink23. The release or contractive tension-lock oi thrust link 23 permits it to resume oscil ation reversely breaking the coupling: about the time the type impacts the printing point A. Nhen the trip link coupling reversely breaks in, the above manner there being no further obstruction to the recoil of the type bar 6, it immediately recoils from A to E while the key lever 12 continues its incident of depression from D. to C and contacting; with stop bar 341.

The dotted line M M indicates the correlat e latienshin Qt he. border Piv ts. 2A? an 25 itlets n Pi t a nwa ds pr ces at ope at n ria lle rted, l ne M M: Eia. I tri-pivotil relationship of 26 to obtuse a e at t e. int o P vot 26 p nt ng i piii l in h per ensrespo ur ng the, orfl P s t on and a tr ts p n O he tape. ar ringh lepress iin. of the key. leve 12. Dotted line M M FigII shows about a 4L5 alignment the border pivots2 i and 25 and the interior pivot 26 at the time the type bar completes its response. or impact and begins to recoil, Dotted l-i shows an obtuse. angle, at t interior. pivot 26 formed by theitri-pivo al. relationship, pointing. downward within the zone 01*} reaetion L as the type bar 6 recoils.

Inherent to the common. key action whene r C a n. keys ar acc de ta ly and sl ht- 1y. depressed part way down the suspend h ir X eTHQQ Z YQ tar ers le s e type. ar G. er er ng wi h t e. response and 11 9. in e tiona ly st uck keys, ut th pli en invention provides the on s, ey. that when the finger. key 153 is slowly depressed, the; type bar. ,6 responds to' the, degree on are G; corresponding, to. the, radius of depression of the key lever 12 nd: m ere a mat m lv .1. eoils without impact with the platen. This. is an. inherent exigency. of my 1 1V ,ention referred teas. theopera ive exp dient by which type ba s respondi g to sl w y depre se keys part way down automatically-'recoils without interfering With responding type, hence the name automatic, type, bar recoil mechanismor flautoniatic coupling. This operative expedient is aceo nplished, by a trippet'plate ififiwith trip hammer 3Q? Intermediately ends thetrippet plate is. pivoted at 31 on the side of; the key lever 12, in the rear of thrust link 23 and is provided with a slot 32 engaging pivot 31 which permit e rpet P a 3. t v rat in lsneadmay and in ppo vement Qi-kv lever 12. The downward movement of the trip hammer 30;. limited by the stop bar 34;. en-

gaged at the incident of depression oil? key e e 2, aus g" the trinp Pl te 3 o, ur on pivot 31. and the torward end 39? to impact with pivotal; point 2d thrust link 23. Trippet plate 30 is provided with top 309- Eig. V held in normal position on top of key lever 12 by return sprin The rear end oiithe upward eurved draw link sustains a frictionless wheel 22 eon muni ting with the angle top 30 of trippet plate 30 in returning the coupling to normal operative position upon release of the-key lever 12.

The trip hammer 30 is wider than the key.

lever at the sadd-lebacked seat and the fulcrum trip nose 28 is as thick as both the key lever and the trip hammer hence the upp r d e of the ri am e n a e h fulcrum trip nose 28 and trips the trip link coupling out of operative tension lock about the time the key lever is depressed part way between radius B and radius C of incident of depression of key lever 12, and when the key lever is slowly depressed, the type bar having no momentum it 'drops back without printing impact. Variations may be resorted to within the scope of the invention, and pertions of the in'lprovement may be used without others.

\Vbat I claim as new and desire to secure by Letters Patent, is:

1. In a typewriting machine, a type bar, a key lever, actuating means at all times operatively connecting the type bar and key lever comprising a backward pull link, a vibratory lever, a reverselybreaking actuating connection operatively connecting the key lever and vibratory lever for moving the type bar to the printing point upon depression of the key lever, means reversely breaking said connection after the printing impact to return the type bar to normal position while the key lever is in depressed position, means restoring said connection to normal operative position upon release of the key lever.

2. In a typewriter machine, a type bar, a key lever, actuating means at all times operatively connecting the type and key lever comprising a backward pull link pivoted to the type bar, a vertically disposed vibratory lever pivoted to the backward pull link, a trip link coupling pivotally connecting said key lever and vibratory lever for moving said type bar to printing point upon depression of the key lever, means reversely breaking said coupling after printing impact of the type bar for returning the type bar to normal position while the key lever is in depressed position, means restoring said coupling to normal operative position upon release of the key lever,

3. In a typewriting machine, a type bar, a key lever, actuating means at all times operatively connecting said type bar and key lever comprising a backward pull link connected to the type bar, a vertically disposed vibratory lever, a pivotal rod. for said vertically disposed vibratory lever intermediately of its ends, a trip link coupling comprising an upward curved draw link and a thrust link at all times operatively connecting said key lever and vibratory lever for moving the type bar to the printing point upon depres 'on of the key lever, means actuating said coupling to return the type bar after the printing impact while the key lever is in depressed position, means restoring said coupling to normal operative position upon release of the key lever.

4. In combination, a type bar, a key lever, a segmental pivot rod therefor, actuating means at all times operatively connecting said key lever and type bar comprising a backward pull link, a vertically disposed vibratory lever pivoted intermediately of its ends, a trip link coupling comprising an upward curved draw link. connected to the vibratory lever, a thrust link pivoted to said key lever intermediately of the ends of the latter and connected to said draw link-moving the type bar to printing point upon depression of the key lever, means reversely breaking said coupling after printing impact of the type bar, means returning the type bar to normal po sition while key lever is in depressed position, means restoring said coupling to normal operative position upon release of the key lever.

In a key action for a typewriting machine, a type bar, a segmental pivot rod therefor, a key lever, actuating means at all times operatively connecting said key lever and type bar comprising a backward pull link operatively connected to said type bar,

vertically disposed vibratory lever with upper end pivoted to said backward pull link, an upward curved draw link operatively connected to said vibratory lever, a thrust link operatively connecting the upward curved draw link and key lever, moving the type bar to printing point upon depression of the key lever, means reversely breaking said coupling after printing impact of the type bar for return of the latter to normal position while key lever is in depressed position, means restoring said coupling to normal operative position upon release of the key lever.

6. In a key action for key-operating maward border pivotal point out of the saddlebacked seat reversely breaking said coupling after printing impact of the type bar for returning the type bar to normal position while key lever is in depressed position, means restoring said forward border pivotal point to the saddle-backed. seat upon release of said key lever.

7. In a type key action, a type bar, a key lever having an upward projection interme diately of its ends, actuating means at all times operatively connecting said key lever and type bar comprising a backward pull link, a vertically disposed vibratory lever, a

' trip link coupling comprising an upward curved draw link and a thrust link pivoted to said upward projection provided by the key lever moving the type bar to printing point upon depression of the key lever, means reversely breaking said coupling after printing impact ofthe type bar, means for the return of the type bar to normal position while key lever is in depressed posit-ion, means restoring said coupling to normal operative position upon release of the key lever.

8. In a type key mechanism, a type bar, a key lever, an upward projection provided by the key lever,'a saddle-backed seat in front of said upward projection, actuating means at all times connecting said type bar and key lever comprising a backward pull link, an upward curved draw link, a vertically disposed vibratory lever pivotally operated the upward curved dra w link, a thrust link pivoted to the upward projection of the key lever and riding the saddle-backed seat moving the type bar to printing point upon depression of the key lever, means returning the' type bar to printing point upon depression of the key lever, means reversely breaking said coupling after printing impact of the type bar, means returning the type bar to normal position while key lever is in depressed position, means restoring said coupling to normal operative position u'pon release of the key lever.

9. In atype key action mechanism, a'key lever, a type bar, actuating means at all times" operativelyconnecting the key lever and type bar comprising a backward pull link, an upward curved draw link, a vertically disposed vibratory lever extending upwardly and downwardly from its pivot and connecting said draw link and backward pull link, a thrust link connecting said upward curved d'raw link and key lever moving bodil'y downward witlr said key lever upon depression of the latter responding the type bar toprintingpoint, means limiting the downward movement of the forward end of said thrust link reversely breaking said couplingafter,

the printing impact of the type bar for returning the latter to normal position while key lever is in depressed position, means for restoring the thrust link to normal operative position upon release of the'key lever.

10'. In a type key mechanism, a type bar, a key lever, an actuating means at all times operativel'y connecting the key lever and type bar comprising a backward pull link, a vertically disposed vibratory lever, a trip link coupling horizontally disposedand engaged above the upwaid projection thereof,"

actuating means" at all times operatively connectin-gsaid type bar and key lever compris ing a backward pull link, a vertically dlsposed'vi'bratory lever, a trip hnk coupling comprising a relatively long upward curved" draw link and a relatively short thrust link pivoted to the upward projection of the key lever and nr'rrnrally operating within: the concave of said draw link moving the type bar to the printing point upon d'e-pressi'o'l'i' oftl'ie key lever, means tripping said thrust link out of the concave of said upward curved draw link reversely breaking said coupling after the printing impact of the type bar for re turning the type bar to normal position while I the key lever is in depressed position, means restoring said thrust link to its normal oper: ative position within the concave of said upward curved draw link upon release of thekey lever. i

1'2. lina typewriter key action, a type bar, a key lever, actuating at all times'operatively connecting said type bar and key lever comprising a backward pull link, a verticallydisposed vibratory lever an upwardcurved draw link operating inf an up per Zone of an actuating plane, at-hru'st link operating witl'nnthe forward radius of an actuatingplan'e', a backward border pivot connecting"sa1'd draw link and vibratery lever at the backward border of an aetuat ing plane, a" forward border pivot connectlng said thrust link and draw l nk at the forward border ofsa rdactuatm'g plane, an mterior pivot of the actuating plane connecting said drawlink and key lever normally ina zone of response moving the type bar to printing point upon depression of the key lever, means actuating the interior pi-vot downward across a divert tension line be tween the forward border pivot and the, backward border pivot breaking ii-eversely said mechanism after the printing impact of the type bar for returning the type bar to normal positioi'i while the key lever-is in depressed position, meansrestori-ng the interior pivot to its normal operative position within the upperzone of response upon release of the key lever.

13'. In a key action for a typewriting mall'O chine, a type bar, a? key lever, actuating means at all times operatively connecting said type bar and key lever comprising a? vertically disposed vibratory lever, a: backward pull link operatively connecting the vib *2- tory' lever and type bar', a'tr'ip link coupling comprising an upward curved-draw link and a thrust linkoperatively connecting the vi bratory lever and key lever moving the type bar to printing point upon depression of the key lever, a fulcrum trip nose provided by the forward end of the upward curved draw link, a saddle backed seat provided by the key lever cooperating with said fulcrum trip nose reversely breaking said coupling after the printing impact of the type bar, a return bar extending across the machine above the key lever cooperating with the fulcrum trip nose after the recoil of the type bar, restoring said coupling to normal operative position upon release of the key lever.

1-1. In a typewriting machine, a type bar, a key lever, actuating means at all times operatively connecting the type bar and the key lever comprising a backward. pull link, a vertically disposed vibratory lever, a thrust link pivoted to the key lever, an upward curved draw link pivoted intermediately of its ends to the lower end of said vibratory lever and its forward end pivoted to the front end of said thrust link moving the type bar to printing point upon depression of the key lever, means reversely breaking said coupling after printing impact of the type bar returning the latter to normal position while the key lever is in depressed position, an angle top trippet plate communicating with the upper edge of said key lever for holding said trippet plate in normal position, a frictionless wheel carried by the rear end of said upward curved draw link communicating with the angle top trippet plate restoring said coupling to normal operative position upon release of the key lever.

15. In a mechanical movement for a typewriter key, a type bar, a key lever, a backward pull link operatively connected to the type bar, a vertically disposed vibratory lever operatively connected to the backward pull link, elements of a trip link coupling comprising an upward curved draw link and a thrust link, a forward border pivot of an actuating plane connecting the forward end of the upward curved draw link and the forward end of the thrust link above the key lever, an interior pivot connecting the thrust link to the side of the key lever interior of the actuating plane and within an upward zone of response during normal position of said coupling, a backward border pivot of the actuating plane connecting the upward curved draw link and vibratory lever moving the type bar to printing point upon depression of the key lever, means reversely breaking said coupling after the printing impact of the type bar returning the latter to normal position while key lever is in depressed position, means restoring said coupling to normal operative position upon release of the key lever.

16. In a recoil mechanism for a type key,

a type bar, a key lever, actuating means at all times operatively connecting the key lever and the type bar comprising a backward pull link, a vertically disposed vibratory lever, an upward curved draw link, and

a thrust link moving the type bar to printmg point upon depression of the key lever, means reversely breaking said coupling after the printing impact of the type bar, an angle of said trippet plate with a plurality of.

holes therein, a return spring supported by the upward curved draw link and trippet plate moving in opposition to the tension thereof returning the type bar to normal position while key lever is in depressed position, means restoring said mechanism to normal operative position upon release of the key lever.

17. In a mechanical movement writing machine key, a key lever, a type bar, elements connecting said key lever and type bar comprising a backward pull link, a vertically disposed vibratory lever, a trip link coupling composed of an upward curved draw link and a thrust link, normal operative posit-ion of the elements of said coupling being folded moving the type bar to printing point upon depression of the key lever, elements of said coupling unfolding reversely breaking said connection after the printing impact of the type bar returning the latter to normal position while key lever is in depressed position, means restoring the elements of said coupling to normally folded position upon the release of the key lever.

18. In a type key mechanism, a type bar, a key lever, means connecting the type bar and key lever comprising a vertically disposed vibratory lever, a backward pull link operatively connecting the vibratory lever and type bar, a trip link coupling comprising an upward curved draw link and a thrust link, a forward border pivot operatively connecting the draw link and thrust link, a backward border pivot operatively connecting said draw link and vibratory lever, an interior pivot operatively connecting the key lever and thrust link operating in a plane between said forward border pivot and backward border pivot above a reverscly breaking line drawn through said backward border pivot and forward border pivot operatively interlocking said coupling moving thetype bar to printing point upon depression of the key lever, means actuating said thrust link downwardly moving said interior pivot below sai-d reversely breaking line drawn through the forward border pivot and backward border pivot reversely breaking said coupling after printing impact of the type bar for returning the latter to normal position while the key lever is in depressed position, means actuating said thrust link upwardly moving said interior pivot above the for a typereversely breaking line drawn through the forward border pivot and backward border pivot restoring said coupling to normal operative position upon release of the key lever.

19. In an automatic recoil mechanism for a typewriter key, a type bar, a key lever having an upward projection, a vertically disposed vibratory lever, a backward pull link operatively connecting the vibratory lever and type bar, a trip hook coupling comprising an upward curved draw link and a thrust link operatively connecting the vibratory lever and key lever moving the type bar to printing point upon depression of the key lever, an angle top trippet plate operatively pivoted at the side of the key lever in the rear of said upward projection of the key leversaid angle top of the trippet plate riding the upper edge of the key lever stopping the movement of the trippet plate at its downward movement of said trip hammer upon depression of the key lever, upper edge of said trip hammer communicating with said thrust link reversely breaking said coupling automatically returning the type bar to normal position without printing impact upon slow depression of the key lever, means restoring said mechanism to normal pperative position upon release of the key lever.

Signed at Fort Collins, in the county of Larimer, and in the Stateof Colorado this th day of April, A. D. 1925.

' ORVILLE U. DESHA. 

